1 files changed, 19 insertions, 4 deletions
diff --git a/csharp/ProtocolBuffers/Descriptors/FileDescriptor.cs b/csharp/ProtocolBuffers/Descriptors/FileDescriptor.cs
index 9e065c86..b3beea0b 100644
--- a/csharp/ProtocolBuffers/Descriptors/FileDescriptor.cs
+++ b/csharp/ProtocolBuffers/Descriptors/FileDescriptor.cs
@@ -1,8 +1,23 @@
-using System;
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.
+// http://code.google.com/p/protobuf/
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using Google.ProtocolBuffers.DescriptorProtos;
-using System.Collections.Generic;
-using Google.ProtocolBuffers.Collections;
+
 namespace Google.ProtocolBuffers.Descriptors {
 
   /// <summary>
@@ -10,7 +25,7 @@ namespace Google.ProtocolBuffers.Descriptors {
   /// IDescriptor is implemented such that the File property returns this descriptor,
   /// and the FullName is the same as the Name.
   /// </summary>
-  public class FileDescriptor : IDescriptor<FileDescriptorProto> {
+  public sealed class FileDescriptor : IDescriptor<FileDescriptorProto> {
 
     private readonly FileDescriptorProto proto;
     private readonly IList<MessageDescriptor> messageTypes;